As Laruen dismounted from you and floated upwards you were prepared to make your next wish. At first you thought that you might want to be a merman but a crazy idea popped into your head and wouldn't let go. Eventually you reasoned that neither Molly nor Lauren would really mind.
So as Molly wrapped her lips around your cock you said "I wish I was a mermaid." Both Molly and Lauren looked at you with wide eyes as an intense tingle spread through your whole body. It wasn't painful, but it wasn't pleasurable either. As you looked down you could see all of the body hair disappearing from you. Even your pubic hair seemed to vanish. At the same time you saw your hips begin to flare outwards while your waist began to push inwards. As you watched your arms and legs both lost muscle mass, becoming more slender and feminine while your nails lengthened at the ends of your hands.
As Lauren watched her wide eyes were replaced by a smile as she took a position next to Molly. Molly had removed her mouth from your hardness when you started to change but Lauren was eager to pick up the task, teasing and sucking at you even as you began to become smaller in her mouth.
A bit of hair started to float past your eye and you brushed it aside with an annoyed look. With a shock you realized that your hair had lengthened out to a dark black curtain. You only had a second to appreciate that before your attention was drawn to your narrowing shoulders and the budding beginnings of breasts on your chest. This was enough to get Molly's attention as she kicked her black tail to get a closer look at you. A widening in her eyes was met with a new feeling from your face, a sort of popping that meant that your features were rearranging themselves.
"Oh my- He- er- she's turning-" Molly started but Lauren shushed her.
"Let it be a surprise," Lauren gave you a wicked look before taking your manhood back into her mouth. It was only about two inches long now and you could feel your balls creeping up into your body. You gave a little whimper as you felt them disappear completely and you felt the water against the new slit they left behind. Lauren continued to suck at your cock until it had entirely retreated into you and become your new clit. Then Lauren started to put those oral skills you'd given her to the test and you soon found your newly feminine hips bucking in pleasure while a much higher pitched voice than you were used to moaned. While you were still getting used to this you felt your legs being drawn together and Lauren had to get out of the way as dark blue scales started spreading down them.
Simultaneously your breasts began developing more rapidly and soon you had a pair that surpassed even Lauren's in size. Finally, as your changes completed, Lauren brought you to your first female orgasm and you gave a long musical moan similar to Lauren's.
"This will be different..." Molly said. Her tone implied that different did not equal bad and as she swam up to you and pressed her breasts against yours to kiss you, you found yourself agreeing.
"We need to find you a mirror," Lauren said.
You broke off your kiss with Molly and said, "I wish I had a mirror."
A full length mirror with an elaborate silver frame appeared on the ocean floor next to you. As you looked in it you gasped. You had become...